Back in February, we posted the story of a reader who got a great deal from an online discount vendor on a Samsung MP3 player, but learned that there was a reason why the deal was so fab. It had been manufactured for the Chinese market, not the United States market, and made its way to her pocket through gray market channels. That meant that it didn’t have a warranty through Samsung USA: if she wanted to fix it, she had to send it for repair in Hong Kong. Okay, but what’s the “gray market?” [More]